DESCRIPTIONS OF TWO NEW ISOPODS, AN APSEUDES 

 AND A MUNNOPSIS, BOTH FROM THE GALAPAGOS 

 ISLANDS. 



By Harriet Richardson, 



Collaborator, Division of Marine Invertebrates, United States National Museum. 



In 1888, during the cruise of the U. S. Bureau of Fisheries steamer 

 Albatross around South America, two specimens, representing two 

 new species of isopods belonging to different genera, were collected 

 off Chatham Island, Galapagos Islands, at the same station and in a 

 great depth, 812 fathoms. These species are described below. From 

 the same locality and depth a specimen of Arcturus was obtained, 

 which has been referred to A. ahyssicola Beddard. 



APSEUDES GALAPAGENSIS, new species. 



Body narrow, elongate. Color white. 



Head narrower anteriorly than posteriorly, with the front pro- 

 duced in the middle m a long slender acute rostrum, which has at 

 the base on either side a rounded bulblike expansion; the rostrum 

 extends forward to the middle of the basal article of the first antennae. 

 •The shape of the rostrum is similar to that in Apseudes spinosus 

 (M. Sars). On either side of the rostrum, the ocular process is pro- 

 duced in a long, acute spine, equal in length to the rostral spine. 

 There are no eyes. The basal article of the first antennae is long 

 and narrow and extends forward; it is unarmed; the second and 

 third articles are short and subequal and together are about half 

 as long as the basal article; the flagellum is composed of 14 arti- 

 cles, the secondary filament of 6 articles. The second antennae are 

 slender and frail; the first article is short, about as broad as long; 

 the second, fourth and fifth articles are subequal and each is about 

 three times as long as the first article ; the third is minute ; the flag- 

 eUum is composed of 7 articles. A scale is articulated to the second 

 article. (See fig. 1.) 



The first segment of the thorax is united with the head to form a 

 carapace, as is usual in this genus. The second segment (fii-st free 

 segment) is produced on either side of the epimeron in a small spme, 

 the post-lateral angle being rounded. The epmieron is produced in 



Proceedings U. S. National Museum, Vol. 43— No. 1926. 



159 



